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You may be asking about delamination. Simply put, if you look up the literature on Alkyds, you will see that unless physically or chemically abraded, an alkyd coat does not always bond well to itself.
Also it is wise to note, that though alkyds can, through the use of driers, be made to dry overnight, the oil in the alkyd still needs time to cure,usually 6 months for linseed oil and 8 months plus for low linolenic oils, such as safflower, walnut and poppy oil. This is for thin coats of paint.
To fully try to understand any of this please look it up. Thank you.
Titanium White is very opaque when compared to Lead White and, Titanium White should remain so down through the centuries, it's inert in drying oils. There is a chart available on-line at TiPure Dupont where you see this expressed as a numerical
value.
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Khaimraj
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